氢
扩散
颗粒
化学
催化作用
热力学
分析化学(期刊)
化学工程
材料科学
色谱法
有机化学
复合材料
物理
工程类
出处
期刊:Aiche Journal
[Wiley]
日期:1997-02-01
卷期号:43 (2): 475-485
被引量:3
标识
DOI:10.1002/aic.690430220
摘要
Abstract Strong intraparticle diffusion resistance was observed and the apparent effectiveness factors were measured for the hydrogenation of 3‐hydroxypropanal (HPA) to 1,3‐propanediol (PD) over Ni/SiO 2 /Al 2 O 3 catalyst pellets at 45 to 80°C and 2.60 to 5.15 MPa in a stirred reactor with a spinning basket. A mathematical model was proposed to describe the intraparticle diffusion and to estimate the effective diffusion coefficients of HPA, PD and hydrogen under reaction conditions by a maximum likelihood function of the apparent effectiveness factors of HPA and PD. The calculated concentration distributions of HPA, PD and hydrogen in catalyst particles reveal an excess of hydrogen at 80°C and higher temperatures, but an excess of HPA at 45°C. It results in a weak dependence of the consumption formation rate of HPA and PD on the partial pressure of hydrogen at high temperature.
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